Description

Guns of generally similar construction and performance but built by different manufacturers.

Model 1918 was in single mounts, Model 1918/19 was the same weapon but in twin mountings. Models 1924 and 1926 were very similar and were in twin mountings.

This or a similar weapon was used on the Brazilian submarine Humaita, which was built during 1927-28 by Odero-Terni, Spezia.

Gun Characteristics

Designation 120 mm/45 (4.7") Models 1918, 1924 and 1926
Ship Class Used On Leone, Sauro, Turbine and Sella classes
Manufacturer Schneider-Canet-Armstrong: 1918 and 1918/19
Vickers-Terni: 1924
OTO: 1926
Date of Design 1918 (1924 and 1926)
Date In Service 1919
Gun Weight 9,600 lbs. (4,354 kg)
Gun Length oa 196.3 in (4.985 m)
Bore Length 212.6 in (5.400 m)
Rifling Length N/A
Grooves N/A
Lands N/A
Twist N/A
Chamber Volume N/A
Rate Of Fire 7 rounds per minute

Ammunition

Type Bag (may have been separate)
Projectile Types and Weights HE: 48.5 lbs. (22 kg)
AP: 51.0 lbs. (23.15 kg)
Bursting Charge N/A
Projectile Length N/A
Propellant Charge 16.75 lbs. (7.6 kg)
Muzzle Velocity Model 1918: 2,460 fps (750 mps)
Others: 2,789 fps (850 mps)
Working Pressure N/A
Approximate Barrel Life N/A
Ammunition stowage per gun N/A

Range

Range with 48.5 lbs. (22 kg) HE shell
Elevation Distance
33 degrees 16,950 yards (15,500 m)

Mount/Turret Data

Designation
  • Single Mount:
    • AMCs, troop transports: M1918
    • Sella (1): M1918
  • Twin Mount
    • Leone (4) and Sella (1) 1: M1918/19
    • Sauro (2) and Turbine (2): M1926
Weight Single: N/A
Twin: 16.6 tons (16.9 mt)
Elevation Model 1918: -10 / +30 degrees
Model 1918/19: -10 / +32 degrees
Model 1924 and 1926: -10 / +33 degrees
Elevation Rate Manual operation, only
Train about +150 / -150 degrees
Train Rate Manual operation, only
Gun recoil N/A

The twin mountings had the guns only 22.8 in (58 cm) apart and suffered from dispersion problems as a result.

  • ^The Sella class originally had a single gun on the bow, but this was replaced in 1929 by a M1926 twin mounting. It would appear that the stern mount was also changed to a M1926 at this time or it could have always been a M1926 twin mount.

Sources

"Naval Weapons of World War Two" by John Campbell
"Italian Warships of World War II" by Aldo Fraccaroli
"Destroyers of World War Two" by M.J. Whitley

Page History

07 January 2008 - Benchmark
17 January 2017 - Converted to HTML 5 format and minor changes